While I was correct about the lens firmware updates being needed, I was partially incorrect about the nature of Dual-Sensing IS. Rather than using the gyro sensors in the camera, it uses data directly from the camera's CMOS image sensor to provide additional information about the amount of camera shake, and that information is used to enhance the effectiveness of the lens-based optical image stabilization.

Canon has released lens firmware updates for some of the EF-M lenses to support Dual-Sensing IS when used with the EOS M50 (and presumably, future M bodies that will ahve dual-sensing IS):

Canon has released updates for the three EF-M lenses to support dual sensing IS – which is a combination of both in camera body and lens based shake detection which is used by the lens to determine the amount of stabilization required.

Right now, only the EOS-M50 supports dual sensing IS.

The firmware can be found on the lens pages at Canon USA under “firmware”;

So the Dual Sensing IS will only work exclusively with EF-M lens only?

Correct, unless Canon updates firmware for other lenses (EF/EF-S) which could be mounted via the adapter. Regardless, any such update for your lens would have to come from Sigma, and for that they would have to reverse engineer the necessary information processing (in other words, don't hold your breath).

If there are more lenses EF/EFs being updated then this feature will show up in the DSLR cameras. But if no other lens gets this firmware update then it will be limited to EOS-M bodies. The first EF lens that should get this update is the nifty-fifty or the 40mm.

If there are more lenses EF/EFs being updated then this feature will show up in the DSLR cameras. But if no other lens gets this firmware update then it will be limited to EOS-M bodies. The first EF lens that should get this update is the nifty-fifty or the 40mm.

I do not believe that will happen. Dual-sensing IS uses data from the image sensor, and in a dSLR, that is only exposed during the actual image capture (too late for IS to be of benefit, and I really don't see them implementing this just for live view). So, this is a feature that will be restricted to mirrorless bodies. They could still update EF/EF-S lens firmware for it, but honestly I doubt they will do so.

Rather than using the gyro sensors in the camera, it uses data directly from the camera's CMOS image sensor to provide additional information about the amount of camera shake, and that information is used to enhance the effectiveness of the lens-based optical image stabilization.

I do not believe that will happen. Dual-sensing IS uses data from the image sensor, and in a dSLR, that is only exposed during the actual image capture (too late for IS to be of benefit, and I really don't see them implementing this just for live view). So, this is a feature that will be restricted to mirrorless bodies. They could still update EF/EF-S lens firmware for it, but honestly I doubt they will do so.

agree 100%

Yet another *unique systemic advantage* of mirrorless cameras over all those antiquated mirrorslappers and mirrorflickers ... and (potentially) helpful *with every single capture* !

I do not believe that will happen. Dual-sensing IS uses data from the image sensor, and in a dSLR, that is only exposed during the actual image capture (too late for IS to be of benefit, and I really don't see them implementing this just for live view). So, this is a feature that will be restricted to mirrorless bodies. They could still update EF/EF-S lens firmware for it, but honestly I doubt they will do so.

agree 100%

Yet another *unique systemic advantage* of mirrorless cameras over all those antiquated mirrorslappers and mirrorflickers ... and (potentially) helpful *with every single capture* !

Did you really need to invent another term for SLR? You’ve been using mirrorslapper for quite some time now, but mirrorflicker? Really?

What are shutters? Curtainsliders?

Also, it’s not a systematic advantage of mirrorless cameras. It’s entirely possible to implement it in a camera with a mirror even if a manufacturer elects not to. Canon for example put DPAF in SLRs. Even though it only functions when the mirror is up, it advantages those reflex cameras.

If there are more lenses EF/EFs being updated then this feature will show up in the DSLR cameras. But if no other lens gets this firmware update then it will be limited to EOS-M bodies. The first EF lens that should get this update is the nifty-fifty or the 40mm.

Nifty-fifty and 40/2.8 have no IS. There is nothing firmware update can do about that. This isn't IBIS replacement, but optical IS booster. It wont give stabilization to lens that does not have it.

If there are more lenses EF/EFs being updated then this feature will show up in the DSLR cameras. But if no other lens gets this firmware update then it will be limited to EOS-M bodies. The first EF lens that should get this update is the nifty-fifty or the 40mm.

Nifty-fifty and 40/2.8 have no IS. There is nothing firmware update can do about that. This isn't IBIS replacement, but optical IS booster. It wont give stabilization to lens that does not have it.

You are so right. Now I can't think of any EF(s) lens that is a likely candidate, possible the 18-135 STM/USM variants.

The ones with in body image stabilizers would quite naturally be “sensor wigglers.” And lenses with the ability to change focus: “optics pushers.”

*mirrorslappers* are (D)SLRs with a massive, solid, honest, down-to-earth, 19th century mechanic, wood-chopper axe and miners hammer type mirror SLAP ... BA-WHAMM, THUD! [first and foremost some Nikon models, Canon does not even manage to get this "really right") ... you can see the photog's hand shaking almost like the re-coil of a large-calibre handgun ... laying waste to any image capture at speeds slower than 1/125s ... and those shots ring out ... clearly audible all the way to the very last benches in church at a wedding ... or at concerts ... preferably during the most delicate pianissimo stretches of music ... when - seemingly inevitable - some trigger-happy dumbass photog manages to fire off an entire buffer-filling 11fps salvo

*mirrorflickers* are sorry little mirrorswinging Rebel-class pieces of plastic and other junk, that only manage to disturb bystanders in a 3 metre radius and produce just enough vibration to ever so sneakily ruin half of the shots taken ... of course only to be noticed after the event ... during closer review of shots on a real monitor ...

optical lenses in general I'd just call "photon grinders" ... weak lenses should be denominated with a warning sticker like on cigarette packs ... "Kills Photons!"